Miscellaneous Other Income

12 Months Ended

Dec. 31, 2023

Other Income and Expenses [Abstract]

Miscellaneous Other Income

MISCELLANEOUS OTHER INCOME:

	For the Years Ended December 31,
	2023		2022		2021
Contract Buyout	$	16,350	$	—	$	—
Interest Income	13,597		6,031		3,287
Royalty Income - Non-Operated Coal	8,855		10,258		8,661
Rental Income	2,129		2,239		1,095
Sale of Certain Mining Rights	—		—		21,756
Other	12,330		5,826		3,595
Miscellaneous Other Income	$	53,261	$	24,354	$	38,394

Contract buyout income was primarily the result of partial contract buyouts that involved negotiations with several customers to reduce coal quantities for which they were otherwise obligated to purchase under contracts in exchange for payment of certain fees to the Company, and did not impact forward contract terms.

Interest income increased primarily due to the Company's investment in marketable debt securities, primarily comprised of highly liquid U.S. Treasury securities, during the year ended December 31, 2023.

Royalty income represents earned revenue related to overriding royalty agreements or coal reserve leases between the Company and third-party operators.

The sale of certain mining rights involved transactions in connection with future coal reserves completed in the year ended December 31, 2021.